vigilant

adj. 机警的，警惕的

victorious, victoriously, victory, victual, victualler (US also victualer), victuals, vicuna, vide, video, video game, video nasty, videodisc, videotape, vie, Vietnam, view, viewer, viewpoint, vigil, vigilance, vigilante, vigilantly, vignette, vigor, vigorous, vigorously, vigour, vigour (US vigor), Viking, vile, vilely, vileness, vilification, vilify, villa, village, villager, villain, villainous, villainously,